Bedienungsanleitung Sorel MHCC 24V (Seite 21 von 28) (Englisch)

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Heat request

The MHCC can request a heat source (burner, heat pump, ...) if the heating circuit does not have enough energy (VL temperature).

Therfor either the signal output V1 is used or the request is transferred via the CAN bus to another controller in the CAN network.

Switching: Request is made via signal output V1.

Output signal to V1: "no request" = 0V, "request" = 10V

If a potential-free contact for the heat source is required, an external switching relay (part no. 77502) must be connected to

V1 See " External relay at signal output V(X) (0-10V / PWM) " on page 9.

Modulating: Request is made via signal output V1. The MHCC outputs the requested temperature (calculated target VL) as a voltage

via the signal output.

Example: Calculated target VL heating circuit 43 ° C, measured VL at sensor S2 40 ° C.

If the VL sensor exceeds the setpoint VL by 2K (preferece/actual -) for 1 minutes, the MHCC requests a heat source with 4.3V (cor-

responds to 43 ° C setpoint VL).

The requested temperature can be raised with the value "mod. Offset". 0.1 V correspond to 1 ° C. If you set an offset of 0.5 V, this res-

ults in a requested temperature of 48 ° C or 4.8 V (43 ° C corresponds to 4.3 V + 0.5 V (offset) = 4.8 V corresponds to 48 ° C)

CAN: Request is made via the CAN bus; the heat request must be activated (switching or modulating) on a controller in the network.

This controller receives the request via the CAN bus and passes it to the connected heat source.

Eco mode (during solar charge)

If the MHCC is connected via CAN bus with another controller with activated solar function, the eco mode of the MHCC can be oper-

ated in 2 different variants for this function:

Turn off: The function is not started with an active solar charge.

Lowering: The Energy saving mode switches the heating on when T eco is undershot and heats up to T eco + hysteresis when solar

charge or solid fuel boiler is active.

Reference/Actual -

Switch on hysteresis for additional heating

This setting determines the allowed undershoot of the heating circuit temperature below the calculated reference fl ow temperature. If

the heating circuit flow temperature and the storage temperature drop below the reference flow temperature by this value, the addi-

tional heating will start the additional heat source after a 1 minute delay.

Heat request is started when the flow temperature is continuously below reference temperature for 1 minute.

Insulation factor

Depending on the selected factor, the outdoor temperature has an influence on the VL temperature calculation after the set delay.

0= Off, 1= 15 minutes, 2= 60 minutes, 3= 120 minutes, 4= 300 minutes

Better insulated buildings can increase comfort and save energy by increasing the building factor.

Threshold

For Energy saving mode

If eco mode (see "Eco mode") is set to threshold: During a solar charge, this setting value "threshold" is used as the setpoint instead of

"TH reference". When the temperature drops below T eco at thermostat sensor 1, the relay is switched on and heats up to Threshold +

hysteresis.

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